The new salary plan will bring raises ranging from 7 percent to about 14 percent. Teachers in the middle of the pay scale will receive the largest raises because their salaries had lagged behind those paid in surrounding counties. The school board and the Lake County Education Association, which represents teachers in collective bargaining, have sought to keep local salaries competitive.

Besides raises, the changes in the contract call for increasing by 2 percent the amount paid to teachers who take on extra duties, such as coaching and club sponsorships. Those jobs will be studied during the coming year by a committee representing the school board and the teachers union in an effort to make supplemental salaries more competitive with surrounding counties.

Another joint committee will examine a school board proposal to change the structure of a school district plan to reward schools and employees for outstanding performance.

The school board wants to use all of the money set aside for teacher incentives to reward teachers for taking college courses in areas such as special education, where there are critical teacher shortages or in areas outside the teachers' expertise but to which they had been assigned. Under the current plan, which will be repeated during the 1988-89 school year if Lake County receives state funding for the program, the incentive money also was used to reward teachers for outstanding attendance.